~RAILWAYANA INTEREST-EXPANSION THERMOMETER-BRITISH RAILWAYS~
100 GBP ($130 USD) + postage included
A fine 60 foot rail expansion thermometer by Negretti and Zambra c.1930
Dimensions
15.5. x 5 .5 x 2.5 cm.
Circa
1940
Maker
Negretti and Zambra
Country of manufacture
UK and Ireland
Description
A fine 6 inch copper and mercury thermometer by Negretti and Zambra c. 1930. Used to gap rails according to ambient temperature during installation, this highly conductive device measures in degrees Fahrenheit and measures expansion from 0 to 3/8 inches. Fine overall condition noting one knock near the top right. British Railways issue. Case measures 15.5 x 5.5 x 2.5 cm.
Ask the Dealer
Dealer information
ScientificaOpticae
Scientifica Opticae
Mark Hacking (Scientifica Opticae Inc.) has been an avid collector/dealer for over 30 years. A former Science teacher, he has an innate love for anything natural or mechanical. Specializing in optical (microscopes, telescopes), surveying, medical, weighing and drawing instruments, he is an active participant of the Scientific Instrument Fair in London. Living in Stratford, Ontario, Canada, with his wife and two children; Mark looks forward to meeting as many fellow collectors as possible, and has a worldwide following on eBay (Sciopti).
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